Krofta Engineering Limited offers Floated Sludge. Krofta Engineering Limited offers Dissolved Air Floatation clarifiers [DAF]. The Floated Sludge is fed by gravity or pump to the center distributor, where it mixes with the air released from the recycled air carrier water and then enters the tank. Fine air bubbles lift the suspended, flocculated solids to the water surface. Heavier particles settle rapidly to the tank floor. The zone of clear water formed between the floated and settled solids is then discharged into the outlet annulus where it overflows through an adjustable outlet weir. Adjustment of this weir controls the water level in the tank.
In the Floated Sludge, the floated matter is removed by the rotating spiral scoop, which discharges the sludge through the sludge pipe in the center distributor to sludge well at the tank periphery. A suspended bottom scraper is supported from the structure and moved forward by the scoop drive. The settled sludge is scraped to the center of the tank and into sludge pit constructed in the foundation. From here, the Floated Sludge is removed intermittently through an automatically operated pneumatic valve. The scraper is constructed so as to allow it to rise and slip over any excessive obstructing sludge build-up in order to prevent any damage to the scoop drive.
